When designing a Heroku application, which two approaches observe the Twelve-Factor methodology? Choose 2 answers.

A. On deployment,Heroku fetches and installs any dependencies that are missing according to the application's list of dependencies

B. On startup, the application's source code fetches and installs any dependencies that are missing according to the application's list of dependencies.

C. The application's database configuration is stored in the application's Profile

D. The application's database configuration is stored in the application's config vars.